WO2009000241A2 - Contact exposure device for a printing screen - Google Patents

Contact exposure device for a printing screen Download PDF

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Publication number
WO2009000241A2
WO2009000241A2 PCT/DE2008/001000 DE2008001000W WO2009000241A2 WO 2009000241 A2 WO2009000241 A2 WO 2009000241A2 DE 2008001000 W DE2008001000 W DE 2008001000W WO 2009000241 A2 WO2009000241 A2 WO 2009000241A2
Authority
WO
WIPO (PCT)
Prior art keywords
printing
light
light source
stencil
glass rod
Prior art date
Application number
PCT/DE2008/001000
Other languages
German (de)
French (fr)
Other versions
WO2009000241A3 (en
Inventor
Josef Lindthaler
Hans-Herbert Frintrup
Original Assignee
Josef Lindthaler
Hans-Herbert Frintrup
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Josef Lindthaler, Hans-Herbert Frintrup filed Critical Josef Lindthaler
Publication of WO2009000241A2 publication Critical patent/WO2009000241A2/en
Publication of WO2009000241A3 publication Critical patent/WO2009000241A3/en

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/20—Exposure; Apparatus therefor
    • G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
    • G03F7/2004—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by the use of a particular light source, e.g. fluorescent lamps or deep UV light
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/70—Microphotolithographic exposure; Apparatus therefor
    • G03F7/70058—Mask illumination systems
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/70—Microphotolithographic exposure; Apparatus therefor
    • G03F7/70216—Mask projection systems
    • G03F7/7035—Proximity or contact printers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/70—Microphotolithographic exposure; Apparatus therefor
    • G03F7/70216—Mask projection systems
    • G03F7/70358—Scanning exposure, i.e. relative movement of patterned beam and workpiece during imaging

Definitions

  • the present invention relates to a device for contact exposure according to the preamble of claim 1.
  • the light source is formed from a number of light-emitting diodes arranged in a row.
  • the light source emits a substantially line-shaped light. This light source is moved over the printing template, so that the stencil is exposed gradually.
  • the light emitting diode emits light in a certain scattering angle, wherein the highest light intensity is at a point along the optical axis of the light emitting diode.
  • the highest light intensity is at a point along the optical axis of the light emitting diode.
  • the light is parallel only in the area of the optical axis, and in the area in front of and behind the line-shaped light source, the light rays strike the motif bearing at a certain angle Film and the printing template on. This results in particular in the area of the printed edges of the subject on the stencil blurred, or an over- and under-radiation, which lead to a correspondingly blurred image and blurred pressure channels.
  • the present invention the object of the invention to provide a device for contact exposure of the type mentioned above, with the print edges on the printing edges are shown much sharper.
  • a trained according to this technical teaching device for contact exposure has the advantage that the mitbewegbare with the light source cylindrical lens processed by the light emitting diodes outgoing light rays, so that the light rays focused either parallel or focused on a narrow range on the stencil.
  • the light beams incident in parallel on the printing stencil have the advantage that the printed edges of the motif are imaged precisely on the printing stencil, since the parallel light beams depict the motif 1: 1 on the printing stencil, without the printed edges forming blurred areas. An over- and under-radiation is avoided.
  • the cylindrical lens As a solid glass rod or as a half-glass rod.
  • These two cylindrical lenses have the advantage that the light emitted by the light source is aligned approximately parallel through the cylindrical lens, provided that the cylindrical lens is arranged very close to the light source and that of the light source Outgoing light is focused on a narrow, linear area, provided that the cylindrical lens has a comparatively large distance from the light source. In the areas between the large and the small distance of the cylindrical lens from the light source is also a focusing of the light beams, the focus is not as pronounced in this intermediate area, as in the final position.
  • Focusing the light beams of the light-emitting diodes on a narrow, linear area on the printing stencil has the advantage that light of high intensity can be applied to the printing stencil so that a reliable illumination of the photosensitive emulsions takes place on the printing stencil.
  • Another advantage of focusing the light on a narrow line-shaped area is that now correspondingly weaker LEDs are sufficient to produce the necessary light intensity. This leads to reduced production costs or to an increased life of the light-emitting diode.
  • the distance between the light source and the lens is adjustable. This has the advantage that the user can let the light beams emanating from the light source either parallel or strongly focused impinge on the printing stencil as needed.
  • the light source is held in a housing, extend the front and rear wall in the direction of the stencil printing on the light emitting diodes.
  • the front and the rear wall are designed so that they reach up to the lens, if the lens is set to parallel aligned light beams.
  • the surface of the cylindrical lens facing the light source is antireflected by means of a surface coating so that UV light of the wavelength of 350 nm to 400 nm passes almost completely into the cylindrical lens. This has the advantage that scattered light is avoided and a higher light output occurs.
  • Figure 1 is a schematic representation of a first embodiment of a device according to the invention in front view.
  • Fig. 2a is a schematic representation of the device of Figure 1 in side view. 2b shows an enlarged detail of the device according to FIG. 2a, along the line II in FIG. 2a;
  • FIG. 3a shows a schematic representation of a second embodiment of a device according to the invention in side view
  • FIG. 3b shows an enlarged detail of the device according to FIG. 3a along the line III in FIG. 3a;
  • FIG. 4 shows a schematic representation of a third embodiment of a device according to the invention in side view
  • Fig. 5 is a schematic representation of a fourth embodiment of a device according to the invention in side view. 1, 2a and 2b, a first embodiment of a device according to the invention for contact exposure of a printing stencil 102 is shown.
  • Such printing stencils 102 are used, for example, in screen printing, offset printing, pad printing, flexographic printing or similar printing methods.
  • This device is shown in the drawing only very schematically simplified, but shows all the essential details.
  • the device 100 for contact exposure of a printing stencil comprises here not shown means for receiving a photosensitive printing stencil 102, which is provided with a photosensitive emulsion, here also not shown means for receiving a motif-bearing film 104 and a light source 106, wherein the light source 106 extends over the entire printing stencil 102 in its width and can be moved longitudinally over the printing stencil 102, so that the substantially linear light emanating from the light source 106 passes over the entire printing stencil 102.
  • the film 104 is vacuum drawn onto the stencil sheet 102 to minimize the distance between the film 104 and the stencil sheet 102.
  • a glass sheet 108 is provided which rests on the film 104 to avoid curling in the film 104 and to ensure that the film 104 resting on the stencil sheet forms a planar surface, so that correct printing of the stencil sheet 102 takes place.
  • the housing 112 of the light source 106 encloses the light-emitting diodes 116 such that at least one front wall 118 and one rear wall 120 project beyond the light-emitting diodes 116 in the direction of the printing template 102.
  • the front 118 and the rear wall 120 are designed to be reflective on the inside in order to reflect the stray light emanating from the light emitting diodes 116 as well as possible.
  • a cylindrical solid glass rod 122 is provided below the light source 106, wherein the front 118 and the rear wall 120 of the light source 106 reach up to the solid glass rod 122.
  • the light emanating from the light fields 110 strikes the surface of the solid glass rod 122 and is approximately parallelized by it, so that correspondingly parallel aligned light beams impinge on the glass pane 108. These rays of light pass in parallel through the glass pane 118 and in turn impinge in parallel onto the film 104, the light rays being absorbed in the area of the motif 124 and passing through the film 104 only in the non-motif areas and the emulsion of the printing stencil 102 being exposed.
  • the light emanating from the light source 106 is always aligned in parallel, even if the light source 106 is moved longitudinally over the printing stencil 102. As can be seen in particular from FIG. 2b, this parallel light generates very sharp printed edges on the emulsion of the printing stencil 102, so that high-precision images are produced as a result.
  • a second device 200 for contact exposure of a printing template illustrated in FIGS. 3 a and 3 b corresponds to the first device 100 described above, except that the solid glass bar 222 of the device 200 has a comparatively large distance from the light source 206. Because of this large distance, the light rays emanating from the light source 206 are focused by the solid glass rod 222 on a quasi-line-shaped region, so that this line-shaped region is irradiated with light of a very high intensity. As a result, it is possible to be able to move the light source 206 over the printing template 202 at a higher speed, since this focused light provides for evaluation of the emulsion of the printing template 202 in a shorter time. Alternatively, the power of the LED can be reduced, resulting in a longer life, less heat and less stray light.
  • the solid glass rod is displaceably held on the light source so that the desired distance of the solid glass rod to the light source can be adjusted individually. Intermediate values can also be set in order to achieve partial focusing of the light beams.
  • the device 300 for contact exposure of a printing stencil shown in FIG. 4 differs from the device 100 only in that here a half-glass rod 326 is used, which parallelises the light emanating from the light fields 310.
  • the device 400 for contact exposure of a printing template shown in FIG. 5 differs from the device 200 shown in FIGS. 3 a and 3 b only in that here a half-glass rod 426 focuses the light emanating from the light fields 410.
  • Full glass rod of the device for contact exposure additionally provided with an anti-reflective surface coating so that UV light reaches the wavelength of 350 nm to 400 nm almost unhindered in the solid glass rod.
  • the scatter losses are reduced, resulting in another

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)

Abstract

The invention relates to a contact exposure device for a printing screen (202), preferably for use in silk screen printing, offset printing, pad printing, flexographic printing or the like. Said device comprises means for receiving a light-sensitive printing screen (202), means for receiving a film carrying the pattern, and a light source (206), constituted of light-emitting diodes. Said light source (206) emits a substantially linear light and the light source (206) can be displaced along the printing screen (202). The aim of the invention is to provide a contact exposure device which allows a much sharper representation of the printing edges. The invention is characterized by an optical lens (222) that is interposed between the mobile light source (206) and the printing screen (202) and that moves along with the light source (206).

Description

VORRICHTUNG ZUR KONTAKTBELICHTUNG EINER DRUCKSCHABLONE DEVICE FOR CONTACT EXPOSURE OF A PRINT TEMPLATE
Die vorliegende Erfindung betrifft eine Vorrichtung zur Kontaktbelichtung gemäß dem Oberbegriff des Anspruches 1.The present invention relates to a device for contact exposure according to the preamble of claim 1.
Aus der DE 20 2004 017 044 U1 ist eine Leuchte zur Belichtung vonFrom DE 20 2004 017 044 U1 is a lamp for the exposure of
Siebdruckschablonen und dergleichen bekannt, bei der die Lichtquelle aus einer Anzahl in einer Reihe angeordneter Leuchtdioden gebildet ist. Durch die Anordnung der Leuchtdioden in einer Reihe strahlt die Lichtquelle ein im Wesentlichen linienförmiges Licht aus. Diese Lichtquelle wird über die Druckschablone bewegt, so dass die Druckschablone nach und nach belichtet wird.Screen printing stencils and the like are known, in which the light source is formed from a number of light-emitting diodes arranged in a row. By arranging the LEDs in a row, the light source emits a substantially line-shaped light. This light source is moved over the printing template, so that the stencil is exposed gradually.
Durch die Bauart bedingt sendet die Leuchtdiode Licht in einen gewissen Streuwinkel aus, wobei die höchste Lichtintensität in einem Punkt entlang der optischen Achse der Leuchtdiode liegt. Durch die Anordnung mehrerer Leuchtdioden in einer Reihe liegen auch die Punkte der höchsten Lichtintensität in einer Reihe und die Zwischenräume zwischen diesen Punkten höchster Lichtintensität haben ebenfalls eine recht hohe Lichtintensität, da sich dort Lichtstrahlen der jeweils benachbarten Leuchtdioden treffen und sich deren Lichtintensität aufaddiert. In Bewegungsrichtung vor und hinter der Lichtquelle nimmt die Lichtintensität signifikant ab.Due to the design, the light emitting diode emits light in a certain scattering angle, wherein the highest light intensity is at a point along the optical axis of the light emitting diode. By arranging a plurality of light-emitting diodes in a row and the points of highest light intensity in a row and the spaces between these points highest light intensity also have a fairly high light intensity, since there meet light rays of each adjacent LEDs and their light intensity adds up. In the direction of movement in front of and behind the light source, the light intensity decreases significantly.
Darüber hinaus ist das Licht nur im Bereich der optischen Achse parallel und in dem Bereich vor und hinter der linienförmigen Lichtquelle treffen die Lichtstrahlen in einem bestimmten Winkel auf den das Motiv tragenden Film und die Druckschablone auf. Hierdurch entstehen insbesondere im Bereich der Druckkanten des Motivs auf der Druckschablone Unscharfen, bzw. eine Über- und Unterstrahlung, die zu einem entsprechend unscharfen Bild und zu unscharfen Druckkanälen führen.Moreover, the light is parallel only in the area of the optical axis, and in the area in front of and behind the line-shaped light source, the light rays strike the motif bearing at a certain angle Film and the printing template on. This results in particular in the area of the printed edges of the subject on the stencil blurred, or an over- and under-radiation, which lead to a correspondingly blurred image and blurred pressure channels.
Davon ausgehend liegt der vorliegenden Erfindung die Aufgabe zu Grunde, eine Vorrichtung zur Kontaktbelichtung der eingangs genannten Art zu schaffen, mit der auf der Druckschablone die Druckkanten sehr viel schärfer abgebildet werden.On this basis, the present invention, the object of the invention to provide a device for contact exposure of the type mentioned above, with the print edges on the printing edges are shown much sharper.
Als technische Lösung dieser Aufgabe wird erfindungsgemäß eine Vorrichtung zur Kontaktbelichtung mit den Merkmalen des Anspruches 1 vorgeschlagen. Vorteilhafte Weiterbildungen dieser Vorrichtung sind den Unteransprüchen zu entnehmen.As a technical solution to this problem, a device for contact exposure with the features of claim 1 is proposed according to the invention. Advantageous developments of this device can be found in the dependent claims.
Eine nach dieser technischen Lehre ausgebildete Vorrichtung zur Kontaktbelichtung hat den Vorteil, dass die mit der Lichtquelle mitbewegbare Zylinderlinse die von den Leuchtdioden ausgehenden Lichtstrahlen aufbereitet, so dass die Lichtstrahlen entweder parallel oder auf einen engen Bereich fokussiert auf der Druckschablone auftreffen. Die parallel auf der Druckschablone auftreffenden Lichtstrahlen haben den Vorteil, dass die Druckkanten des Motivs präzise auf der Druckschablone abgebildet werden, da die parallelen Lichtstrahlen das Motiv 1 :1 auf der Druckschablone abbilden, ohne dass die Druckkanten Unscharfen bilden. Eine Über- und Unterstrahlung wird so vermieden.A trained according to this technical teaching device for contact exposure has the advantage that the mitbewegbare with the light source cylindrical lens processed by the light emitting diodes outgoing light rays, so that the light rays focused either parallel or focused on a narrow range on the stencil. The light beams incident in parallel on the printing stencil have the advantage that the printed edges of the motif are imaged precisely on the printing stencil, since the parallel light beams depict the motif 1: 1 on the printing stencil, without the printed edges forming blurred areas. An over- and under-radiation is avoided.
Dabei hat es sich bewährt, die Zylinderlinse als Vollglasstab oder als Halbglasstab auszubilden. Diese beiden Zylinderlinsen haben den Vorteil, dass das von der Lichtquelle ausgehende Licht durch die Zylinderlinse annähernd parallel ausgerichtet wird, sofern die Zylinderlinse sehr nah an der Lichtquelle angeordnet ist und dass das von der Lichtquelle ausgehende Licht auf einen schmalen, linienförmigen Bereich fokussiert wird, sofern die Zylinderlinse einen vergleichsweise großen Abstand von der Lichtquelle aufweist. In den Bereichen zwischen dem großen und dem kleinen Abstand der Zylinderlinse von der Lichtquelle erfolgt ebenfalls eine Fokussierung der Lichtstrahlen, wobei die Fokussierung in diesem Zwischenbereich nicht so stark ausgeprägt ist, wie in der Endstellung.It has proven useful to form the cylindrical lens as a solid glass rod or as a half-glass rod. These two cylindrical lenses have the advantage that the light emitted by the light source is aligned approximately parallel through the cylindrical lens, provided that the cylindrical lens is arranged very close to the light source and that of the light source Outgoing light is focused on a narrow, linear area, provided that the cylindrical lens has a comparatively large distance from the light source. In the areas between the large and the small distance of the cylindrical lens from the light source is also a focusing of the light beams, the focus is not as pronounced in this intermediate area, as in the final position.
Ein Fokussieren der Lichtstrahlen der Leuchtdioden auf einen engen, linienförmigen Bereich auf der Druckschablone hat den Vorteil, dass hierdurch Licht einer hohen Intensität auf die Druckschablone appliziert werden kann, so dass eine zuverlässige Ausleuchtung der lichtempfindlichen Emulsionen auf der Druckschablone erfolgt. Ein weiterer Vorteil des Fokussierens des Lichtes auf einen schmalen linienförmigen Bereich besteht darin, dass nunmehr entsprechend schwächere Leuchtdioden ausreichen, um die notwenige Lichtintensität zu erzeugen. Dies führt zu reduzierten Herstellungskosten oder zu einer erhöhten Lebensdauer der Leuchtdiode.Focusing the light beams of the light-emitting diodes on a narrow, linear area on the printing stencil has the advantage that light of high intensity can be applied to the printing stencil so that a reliable illumination of the photosensitive emulsions takes place on the printing stencil. Another advantage of focusing the light on a narrow line-shaped area is that now correspondingly weaker LEDs are sufficient to produce the necessary light intensity. This leads to reduced production costs or to an increased life of the light-emitting diode.
In einer anderen, bevorzugten Ausführungsform ist der Abstand zwischen der Lichtquelle und der Linse verstellbar. Dies hat den Vorteil, dass der Anwender je nach Bedarf die von der Lichtquelle ausgehenden Lichtstrahlen entweder parallel oder stark fokussiert auf die Druckschablone auftreffen lassen kann.In another preferred embodiment, the distance between the light source and the lens is adjustable. This has the advantage that the user can let the light beams emanating from the light source either parallel or strongly focused impinge on the printing stencil as needed.
In einer weiteren, bevorzugten Ausführungsform ist die Lichtquelle in einem Gehäuse gehalten, dessen Vorder- und Rückwand in Richtung der Druckschablone über die Leuchtdioden hinausreichen. Vorteilhafterweise sind die Vorder- und die Rückwand so ausgelegt, dass sie bis an die Linse heranreichen, sofern die Linse auf parallel ausgerichtete Lichtstrahlen eingestellt ist. In noch einer anderen Ausführungsform ist die der Lichtquelle zugewandte Oberfläche der Zylinderlinse mittels einer Oberflächenbeschichtung entspiegelt, so dass UV Licht der Wellenlänge von 350 nm bis 400 nm annähernd vollständig in die Zylinderlinse gelangt. Dies hat den Vorteil, dass Streulicht vermieden wird und eine höhere Lichtausbeute erfolgt.In a further preferred embodiment, the light source is held in a housing, extend the front and rear wall in the direction of the stencil printing on the light emitting diodes. Advantageously, the front and the rear wall are designed so that they reach up to the lens, if the lens is set to parallel aligned light beams. In yet another embodiment, the surface of the cylindrical lens facing the light source is antireflected by means of a surface coating so that UV light of the wavelength of 350 nm to 400 nm passes almost completely into the cylindrical lens. This has the advantage that scattered light is avoided and a higher light output occurs.
Weitere Vorteile der erfindungsgemäßen Vorrichtung zur Kontaktbelichtung ergeben sich aus der beigefügten Zeichnung und den nachstehend beschriebenen Ausführungsformen. Ebenso können die vorstehend genannten und die noch weiter ausgeführten Merkmale erfindungsgemäß jeweils einzeln oder in beliebigen Kombinationen miteinander verwendet werden. Die erwähnten Ausführungsformen sind nicht als abschließende Aufzählung zu verstehen, sondern haben vielmehr beispielhaften Charakter. Es zeigen:Further advantages of the device according to the invention for contact exposure will become apparent from the accompanying drawings and the embodiments described below. Likewise, according to the invention, the above-mentioned features and those which are still further developed can be used individually or in any desired combinations with one another. The mentioned embodiments are not to be understood as an exhaustive list, but rather have exemplary character. Show it:
Fig. 1 eine schematische Darstellung einer ersten Ausführungsform einer erfindungsgemäßen Vorrichtung in Frontansicht;Figure 1 is a schematic representation of a first embodiment of a device according to the invention in front view.
Fig. 2a eine schematische Darstellung der Vorrichtung gemäß Fig. 1 in Seitenansicht; Fig. 2b eine Detailvergrößerung der Vorrichtung gemäß Fig. 2a, entlang der Linie Il in Fig. 2a;Fig. 2a is a schematic representation of the device of Figure 1 in side view. 2b shows an enlarged detail of the device according to FIG. 2a, along the line II in FIG. 2a;
Fig. 3a eine schematische Darstellung einer zweiten Ausführungsform einer erfindungsgemäßen Vorrichtung in Seitenansicht;3a shows a schematic representation of a second embodiment of a device according to the invention in side view;
Fig. 3b eine Detailvergrößerung der Vorrichtung gemäß Fig. 3a, entlang der Linie IM in Fig. 3a;FIG. 3b shows an enlarged detail of the device according to FIG. 3a along the line III in FIG. 3a; FIG.
Fig. 4 eine schematische Darstellung einer dritten Ausführungsform einer erfindungsgemäßen Vorrichtung in Seitenansicht;4 shows a schematic representation of a third embodiment of a device according to the invention in side view;
Fig. 5 eine schematische Darstellung einer vierten Ausführungsform einer erfindungsgemäßen Vorrichtung in Seitenansicht. In den Fig. 1 , 2a und 2b ist eine erste Ausführungsform einer erfindungsgemäßen Vorrichtung zur Kontaktbelichtung einer Druckschablone 102 dargestellt. Derartige Druckschablonen 102 werden beispielsweise im Siebdruck, Offsetdruck, Tampondruck, Flexodruck oder in ähnlichen Druck- verfahren verwendet. Diese Vorrichtung ist in der Zeichnung nur stark schematisch vereinfacht dargestellt, zeigt aber alle wesentlichen Details.Fig. 5 is a schematic representation of a fourth embodiment of a device according to the invention in side view. 1, 2a and 2b, a first embodiment of a device according to the invention for contact exposure of a printing stencil 102 is shown. Such printing stencils 102 are used, for example, in screen printing, offset printing, pad printing, flexographic printing or similar printing methods. This device is shown in the drawing only very schematically simplified, but shows all the essential details.
Die Vorrichtung 100 zur Kontaktbelichtung einer Druckschablone umfasst hier nicht näher dargestellte Mittel zur Aufnahme einer lichtempfindlichen Druckschablone 102, die mit einer lichtempfindlichen Emulsion versehen ist, hier ebenfalls nicht näher dargestellte Mittel zur Aufnahme eines das Motiv tragenden Films 104 und eine Lichtquelle 106, wobei die Lichtquelle 106 in ihrer Breite über die gesamte Druckschablone 102 reicht und der Länge nach über die Druckschablone 102 verfahrbar ist, so dass das von der Lichtquelle 106 ausgehende, im wesentlichen linienförmige Licht die gesamte Druckschablone 102 überstreift. In der Regel wird der Film 104 mittels Vakuum auf die Druckschablone 102 gesaugt, um den Abstand zwischen Film 104 und Druckschablone 102 zu minimieren. Darüber hinaus ist oberhalb des Films 104 eine Glasscheibe 108 vorgesehen, die auf dem Film 104 aufliegt, um Wellenbildung im Film 104 zu vermeiden und um sicherzustellen, dass der auf der Druckschablone aufliegende Film 104 eine plane Oberfläche bildet, so dass eine korrekte Ausbelichtung der Druckschablone 102 erfolgt.The device 100 for contact exposure of a printing stencil comprises here not shown means for receiving a photosensitive printing stencil 102, which is provided with a photosensitive emulsion, here also not shown means for receiving a motif-bearing film 104 and a light source 106, wherein the light source 106 extends over the entire printing stencil 102 in its width and can be moved longitudinally over the printing stencil 102, so that the substantially linear light emanating from the light source 106 passes over the entire printing stencil 102. Typically, the film 104 is vacuum drawn onto the stencil sheet 102 to minimize the distance between the film 104 and the stencil sheet 102. Moreover, above the film 104, a glass sheet 108 is provided which rests on the film 104 to avoid curling in the film 104 and to ensure that the film 104 resting on the stencil sheet forms a planar surface, so that correct printing of the stencil sheet 102 takes place.
Das Gehäuse 112 der Lichtquelle 106 umschließt die Leuchtdioden 116 derart, dass zumindest eine Vorderwand 118 und eine Rückwand 120 in Richtung der Druckschablone 102 bis über die Leuchtdioden 116 hinausragen. Dabei sind die Vorder- 118 und die Rückwand 120 innenseitig reflektierend ausgebildet, um das von den Leuchtdioden 116 ausgehende Streulicht möglichst gut zu reflektieren. Unterhalb der Lichtquelle 106 ist ein zylindrischer Vollglasstab 122 vorgesehen, wobei die Vorder- 118 und die Rückwand 120 der Lichtquelle 106 bis an den Vollglasstab 122 heranreichen. Das von den Lichtfeldern 110 ausgehende Licht trifft auf die Oberfläche des Vollglasstabes 122 und wird von diesem annähernd parallelisiert, so dass auf der Glasscheibe 108 entsprechend parallel ausgerichtete Lichtstrahlen auftreffen. Diese Lichtstrahlen gehen parallel durch die Glasscheibe 118 hindurch und treffen wiederum parallel auf den Film 104 auf, wobei die Lichtstrahlen im Bereich des Motivs 124 absorbiert werden und nur in den motivfreien Bereichen durch den Film 104 hindurchgelangen und die Emulsion der Druckschablone 102 ausbelichten.The housing 112 of the light source 106 encloses the light-emitting diodes 116 such that at least one front wall 118 and one rear wall 120 project beyond the light-emitting diodes 116 in the direction of the printing template 102. In this case, the front 118 and the rear wall 120 are designed to be reflective on the inside in order to reflect the stray light emanating from the light emitting diodes 116 as well as possible. Below the light source 106, a cylindrical solid glass rod 122 is provided, wherein the front 118 and the rear wall 120 of the light source 106 reach up to the solid glass rod 122. The light emanating from the light fields 110 strikes the surface of the solid glass rod 122 and is approximately parallelized by it, so that correspondingly parallel aligned light beams impinge on the glass pane 108. These rays of light pass in parallel through the glass pane 118 and in turn impinge in parallel onto the film 104, the light rays being absorbed in the area of the motif 124 and passing through the film 104 only in the non-motif areas and the emulsion of the printing stencil 102 being exposed.
Durch den Vollglasstab 122 wird das von der Lichtquelle 106 ausgehende Licht stets parallel ausgerichtet, auch wenn die Lichtquelle 106 längs über die Druckschablone 102 bewegt wird. Wie insbesondere Fig. 2b zu entnehmen ist, erzeugt dieses parallele Licht sehr scharfe Druckkanten auf der Emulsion der Druckschablone 102, so dass hierdurch hochpräzise Bilder entstehen.Through the solid glass bar 122, the light emanating from the light source 106 is always aligned in parallel, even if the light source 106 is moved longitudinally over the printing stencil 102. As can be seen in particular from FIG. 2b, this parallel light generates very sharp printed edges on the emulsion of the printing stencil 102, so that high-precision images are produced as a result.
Eine in den Fig. 3a und 3b dargestellte zweite Vorrichtung 200 zur Kontaktbelichtung einer Druckschablone entspricht der oben beschriebenen ersten Vorrichtung 100 bis auf den Umstand, dass der Vollglasstab 222 der Vorrichtung 200 eine vergleichsweise großen Abstand zur Lichtquelle 206 aufweist. Aufgrund dieses großen Abstandes werden die von der Licht- quelle 206 ausgehenden Lichtstrahlen durch den Vollglasstab 222 auf einen quasi linienförmigen Bereich fokussiert, so dass dieser linienförmige Bereich mit Licht einer sehr hohen Intensität bestrahlt wird. Hierdurch ist es möglich, die Lichtquelle 206 mit einer höheren Geschwindigkeit über die Druckschablone 202 bewegen zu können, da dieses fokussierte Licht in kürzerer Zeit für eine Auswertung der Emulsion der Druckschablone 202 sorgt. Alternativ kann auch die Leistung der Leuchtdiode reduziert werden, was zu einer höheren Lebensdauer, geringeren Wärmeentwicklung und zu weniger Streulicht führt.A second device 200 for contact exposure of a printing template illustrated in FIGS. 3 a and 3 b corresponds to the first device 100 described above, except that the solid glass bar 222 of the device 200 has a comparatively large distance from the light source 206. Because of this large distance, the light rays emanating from the light source 206 are focused by the solid glass rod 222 on a quasi-line-shaped region, so that this line-shaped region is irradiated with light of a very high intensity. As a result, it is possible to be able to move the light source 206 over the printing template 202 at a higher speed, since this focused light provides for evaluation of the emulsion of the printing template 202 in a shorter time. Alternatively, the power of the LED can be reduced, resulting in a longer life, less heat and less stray light.
In einer anderen, hier nicht dargestellten Ausführungsform ist der Vollglas- stab verschiebbar an der Lichtquelle gehalten, so dass der gewünschte Abstand des Vollglasstabes zur Lichtquelle individuell eingestellt werden kann. Dabei können auch Zwischenwerte eingestellt werden, um eine Teilfokussierung der Lichtstrahlen zu erreichen.In another embodiment, not shown here, the solid glass rod is displaceably held on the light source so that the desired distance of the solid glass rod to the light source can be adjusted individually. Intermediate values can also be set in order to achieve partial focusing of the light beams.
Die in Fig. 4 dargestellte Vorrichtung 300 zur Kontaktbelichtung einer Druckschablone unterscheidet sich von der Vorrichtung 100 lediglich dadurch, dass hier ein Halbglasstab 326 verwendet wird, der das von den Lichtfeldern 310 ausgehende Licht parallelisiert.The device 300 for contact exposure of a printing stencil shown in FIG. 4 differs from the device 100 only in that here a half-glass rod 326 is used, which parallelises the light emanating from the light fields 310.
Die in Fig. 5 dargestellte Vorrichtung 400 zur Kontaktbelichtung einer Druckschablone unterscheidet sich von der in den Fig. 3a und 3b dargestellten Vorrichtung 200 lediglich dadurch, dass hier ein Halbglasstab 426 das von den Lichtfeldern 410 ausgehende Licht fokussiert.The device 400 for contact exposure of a printing template shown in FIG. 5 differs from the device 200 shown in FIGS. 3 a and 3 b only in that here a half-glass rod 426 focuses the light emanating from the light fields 410.
In einer anderen, hier nicht dargestellten Ausführungsform ist derIn another embodiment, not shown here is the
Vollglasstab der Vorrichtung zur Kontaktbelichtung zusätzlich mit einer entspiegelnden Oberflächenbeschichtung versehen, so dass UV Licht der Wellenlänge von 350 nm bis 400 nm annähernd ungehindert in den Vollglasstab gelangt. Analoges gilt für den Halbglasstab. Hierdurch werden die Streuverlusste reduziert, was zu einer weiterenFull glass rod of the device for contact exposure additionally provided with an anti-reflective surface coating so that UV light reaches the wavelength of 350 nm to 400 nm almost unhindered in the solid glass rod. The same applies to the half-glass rod. As a result, the scatter losses are reduced, resulting in another
Energieerspamis und zu einer noch stärkeren Lichtausbeute führt. Bezugszeichenliste:Energy spam and leads to an even greater light output. LIST OF REFERENCE NUMBERS
100 200 300 400 Vorrichtung100 200 300 400 device
102 202 Druckschablone102 202 Printing template
104 Film104 movie
106 206 Lichtquelle106 206 light source
108 Glasscheibe108 glass pane
110 310 410 Lichtfeld110 310 410 light field
112 Gehäuse112 housing
116 Leuchtdioden116 light emitting diodes
118 Vorderwand118 front wall
120 Rückwand120 rear wall
122 222 Vollglasstab122 222 solid glass rod
124 Motiv124 motif
326 426 Halbglasstab 326 426 half-glass rod

Claims

Ansprüche: Claims:
1. Vorrichtung zur Kontaktbelichtung einer Druckschablone (102, 202), vorzugsweise zur Verwendung im Siebdruck, Offsetdruck, Tampondruck, Flexodruck oder dergleichen, mit Mitteln zur Aufnahme einer lichtempfindlichen Druckschablone (102, 202), mit Mitteln zur Aufnahme eines das Motiv tragenden Films (104), und mit einer aus Leuchtdioden (116) gebildeten Lichtquelle (106, 206), wobei die Lichtquelle (106, 206) ein im Wesentlichen linienförmiges Licht ausstrahlt und wobei die Lichtquelle (106, 206) entlang der Druckschablone (102, 202) bewegbar ist, gekennzeichnet durch, eine zwischen der bewegbaren Lichtquelle () und der Druckschablone (102, 202) angeordnete Zylinderlinse, insbesondere ein Vollglasstab (122, 222), oder ein Halbglasstab (325, 426), die sich mit der Lichtquelle (106, 206) mitbewegt.1. Apparatus for contact exposure of a printing stencil (102, 202), preferably for use in screen printing, offset printing, pad printing, flexographic printing or the like, comprising means for receiving a photosensitive stencil (102, 202), comprising means for receiving a film carrying the motif (US Pat. 104), and a light source (106, 206) formed of light emitting diodes (116), wherein the light source (106, 206) emits a substantially line-shaped light and wherein the light source (106, 206) along the printing template (102, 202). is movable, characterized by, a between the movable light source () and the stencil printing (102, 202) arranged cylindrical lens, in particular a solid glass rod (122, 222), or a half-glass rod (325, 426), with the light source (106, 206).
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass der Abstand zwischen der Lichtquelle (106, 206) und der2. Apparatus according to claim 1, characterized in that the distance between the light source (106, 206) and the
Zylinderlinse verstellbar ist.Cylinder lens is adjustable.
3. Vorrichtung nach wenigstens einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Lichtquelle (106, 206) in einem Gehäuse (112) gehalten ist, wobei eine Vorder- (118) und eine Rückwand (120) des Gehäuses (112) über die Leuchtdioden (116) hinausreichen. 3. Device according to at least one of the preceding claims, characterized in that the light source (106, 206) in a housing (112) is held, wherein a front (118) and a rear wall (120) of the housing (112) over the Beyond light emitting diodes (116).
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Vorder- (118) und/oder die Rückwand (120) bis an die Linse heranreichen.4. Apparatus according to claim 3, characterized in that the front (118) and / or the rear wall (120) zoom up to the lens.
5. Vorrichtung nach wenigstens einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die der Lichtquelle (106, 206) zugewandte Oberfläche der Zylinderlinse, insbesondere des Vollglasstabes (122, 222) oder des Halbglasstabes (325, 426), eine entspiegelnde Oberflächen- beschichtung aufweist.5. The device according to at least one of the preceding claims, characterized in that the light source (106, 206) facing surface of the cylindrical lens, in particular of the solid glass rod (122, 222) or the half-glass rod (325, 426), has an anti-reflection surface coating ,
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Oberflächenbeschichtung derart ausgelegt ist, dass ausschließlich UV - Licht der Wellenlänge von 350 nm bis 400 nm, vorzugsweise 370 nm bis 380 nm, durchgelassen wird. 6. The device according to claim 5, characterized in that the surface coating is designed such that only UV light of the wavelength of 350 nm to 400 nm, preferably 370 nm to 380 nm, is transmitted.
PCT/DE2008/001000 2007-06-22 2008-06-21 Contact exposure device for a printing screen WO2009000241A2 (en)

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DE200710028859 DE102007028859B4 (en) 2007-06-22 2007-06-22 Apparatus for contact exposure of a printing form

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DE102007028859A1 (en) 2008-12-24

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